Changing a planet graphic, how?

How does one change a planet/stations, graphic?
For the updated version of Sol Research Labs, I have the facilities to create my own planet graphics I just don't know how to implement/ do it.
I am well versed in Photoshop and have a copy of lunarcell and solar cell (whee fun!).
Im fine with other resources in Nova, but I have never had to change those type of resources before.
How do I do it?

And will mission computer do it for me, or will I have to use Nova-Tools?

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"If I were a younger man, I would write a history of human stupidity; and I would climb to the top of Mount Mcabe and lie down on my back with my history as a pillow; and I would take from the ground some of the blue-white poison that makes statues of men; and I would make a statue of myself, lying on my back, grinning horribly, and thuimbing my nose at You Know Who."
- Final Sentance on the Books of Bokonon
(url="http://"http://tru7h.jonpearse.net/scifi.php")The Women of SF Archive(/url)

This tells you all you need to know, and it was extremely useful for me.
(url="http://"http://www.ambrosiasw.com/cgi-bin/vftp/dl-redirect.pl/TutorialsInS.sea.hqx?path=evn/guides&file;=TutorialsInS.sea.hqx")http://www.ambrosias...ialsInS.sea.hqx(/url)

Hope it helps.

Okay, all fixed

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"If I were a younger man, I would write a history of human stupidity; and I would climb to the top of Mount Mcabe and lie down on my back with my history as a pillow; and I would take from the ground some of the blue-white poison that makes statues of men; and I would make a statue of myself, lying on my back, grinning horribly, and thuimbing my nose at You Know Who."
- Final Sentance on the Books of Bokonon
(url="http://"http://tru7h.jonpearse.net/scifi.php")The Women of SF Archive(/url)